Olroth spawn rate bugged. Won't spawn (tried 30 logbooks). Found a Fix.

I ran over 30 logbooks, all level 79-80, from my hideout. Atlas had Disturbed Rest selected. Got no single boss.

Found a fix:

1. I changed Atlas from Disturbed Rest to Weight of History.
2. I opened logbooks in Past Ziggurat Refuge (Past)

Then I got 2 bosses from 4 logbooks.

After just few more logbooks my Expedition Atlas is now 8/8.

So one or both combined bugs Olroth spawn rate, Dannig location and/or Disturbed Rest.